Slap Fight (スラップファイト), also known as Alcon, is a 1986 vertically scrolling shooter arcade game developed by Toaplan and published by Taito.
It takes its inspiration from Xevious (being a vertical scroller) and Gradius (from which it borrows its power-up system), and helps to establish Toaplan's trademark style. The game takes place in an Earth-type environment with metallic, land-based enemies; some are mobile armor and others are fortifications embedded in natural terrain.
Certain enemies leave power-up stars upon destruction. Collecting these stars "turns on" an upgrade menu at the bottom of the screen and moves a lit cursor through the list of power-ups described below. If any power-up is lit, but a ship is lost before a power-up could be selected, the star is "carried over" and the Speed block is lit on the next life. Single hits to the unshielded main ship destroy it, and the player loses any accumulated upgrades including Speed. This can make successive lives difficult to keep in the heat of battle.
This game does not support continues with extra credits, and is believed to "loop" endlessly; that is, after the final boss, gameplay resumes at the beginning of the play map but at successively higher difficulty, with enemies shooting faster and more frequently. Also, the score stops increasing when it displays 9,999,990 points, which might be achieved as early as the 15th, 16th, or 17th loops.
Taking place in the year 2059 in another galaxy, mankind has colonized an alien planet called Theon after evacuating a previously colonized planet Orac. Five years ago, the colony on Orac was attacked by alien invaders and the war was so intense, the colonists were forced to leave. However, Theon is now under attack by the same alien fleet, but the humans are ready. The player assumes the role of an Allied League of Cosmic Nations (ALCON) fighter pilot in the SW475 star fighter to stop the invaders from taking over Theon.
Slap Fight MD itself is a new game mode featuring featured new levels, graphics, weapons, music, etc., plus a new "smart bomb" feature at the cost of Wing powerups. The music for it was composed by Yuzo Koshiro, which is presented on the title screen.
The original game was also included, but with changes such as configuration for the Shield's timer and an in-game announcer.